Improvement in ratchet-drills



UNITED STATES PATEN FFIGE.

IMPROVEMENT IN RATCHET-DRILLS.

Specification forming part of Letters Patent No. 150,826, dated May 12,1874; application filed March 14, 1874. I

To all whom it may concern:

Be it known that I, WALTER CAMPBELL, of Tidioute, in the county ofWarren and State of Pennsylvania, have invented a new and valuableImprovement in Ratchet-Drills; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawingsmaking a part of this specification, and to the lettersand figures ofreference marked thereon.

Figure 1 of the drawings is a representation of a side elevation of myratchet-drill. Fig. 2 is a sectional view of the same.

This invention has relation to hand-drills of the kind which are knownas the smiths press-drills. It consists in the combination, with thedrillstock, ratchet-hub, feed-screw, and spring, of a sleeve-nut screwedupon the stock, and inclosing the spring, as hereinafter explained.

In the annexed drawings, A designates .a cylindrical tubular hub, havinga long handle, B, formed on it. The lower end of this hub is surroundedwith ratchet-teeth t, which engage withcorrespondin g teeth, 1', formedon the upper end of a hub, O. The hub O is constructed with a centralsocket for receiving the bits, and it has formed on its upper end acylindrical stem, 0, which passes freely through; the tubular hub A, andreceives upon its upw per screw-threaded end a hollow cap, D. This caphas a nuthead, d, on its upper end, and

its lower end receives loosely into it the upper reduced end a of thehub A. Inside' of the cap D is a helical spring, 8, which operates byits recoil to keep the teeth t of the two hubs A and O in gear with oneanother. E designates a center -point, having a screw-threaded stem, 0,formed on it, which is screwed into the upper end of the tube 0, asshown in Fig. 2. By turning this screw as the work of drillingprogresses, the bit will be fed up to its work; and by turning the capD, the spring 8 can be made to act with more or less force to keep theratchet-teeth t in gear.

The manner of using this drill is to confine it between the work and anoverhanging arm or bracket, and give a vibrating movement to the handleB, which will impart an intermittent rotary movement to the head 0 andthe drill-bit which is confined therein.

1 am well aware that a ratchet-drill having two hubs connected byannular ratchet-teeth and an adjustable center-point, as shown in thepatent of L. B. Rillard, dated July 31, 1860, No. 29,853, is not myinvention, and therefore I do not claim such invention, broadly; but

What I claim as new, and desire to secure by Letters Patent, is-

The adjustable cap I), with nut-head cl on its upper end, and its lowerend fitting over the reduced end a of the hub A, in combination with thehelical spring 8 and ratchet-hubs A and O, substantially as and for thepurpose mentioned.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

WALTER CAMPBELL.

Witnesses:

JOHN TONKIN, J r., M. G. GUsnrNG.

